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The Study on Seismicity and Relocation of the July 3,2015 Pishan MS6.5 Earthquake

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Earthquake Research in China 2017年第2期31卷 179-187页

作者： Yang Wen Long Haiyun Yao Qi China Earthquake Networks Center CEA Beijing 100045 China Institute of Geophysics CEA Beijing 100081 China

The July 3,2015 Pishan M_S6. 5 earthquake occurred in the intersection area of the Tarim block and West Kunlun block where the moderate-strong earthquakes have become active in recent years. This paper has studied the seismicity parameters of the earthquake sequences such as the b-value in the Pishan region and its vicinity. In addition,we also relocated the aftershocks of the Pishan M_S6. 5 earthquake using the seismic phase report by the double-difference method. The temporal and spatial variation characteristics of the Pishan earthquake sequence in the rupture zone are analyzed. The study is of great significance in the seismic hazard assessment in this region.

关键词： The 2015 Pishan earthquake b-value Relocation Temporal and spatial variation

Hierarchical mechanical behavior of cobalt supracrystals related to nanocrystallinity

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Nano Research 2015年第11期8卷 3480-3487页

作者： Melanie Gauvin Sorbonne Universites UPMC Univ Paris 06 UMR 8233 MONARIS Paris F-75005 France CNRS UMR 8233 MONARIS Paris F-75005 France cea/IRAMIS CEA Saclay Gif-sur-Yvette 91191 France

Here, we report on hierarchical mechanical behavior of 500-nm-thick Conanocrystal 3D superlattices （supracrystals） induced by either the crystalline structure （nanocrystallinity） or the length of the coating agent of Co nanocrystals. Increasing the nanocrystal shape anisotropy of Co nanocrystals through the control of their nanocrystallinities induces a higher level of ordering with both translational and orientational alignment of nanocrystals within the supracrystals. The hierarchy in ordering at various scales, i.e., from the atomic lattice within the nanocrystals to the nanocrystal superlattices within supracrystals, is correlated with marked changes in the Young＇s modulus of supracrystals： From 0.7 ±0.4 to 1.7 ±0.5 and to 6.6 ±1.5 GPa as the crystalline structure of Co nanoparticles changes from amorphous-Co to ε-Co and to hexagonal compact packing （hcp）-Co, respectively. Moreover, for supracrystals of 7 nm amorphous Co nanoparticles, the Young＇s modulus decreases by one order of magnitude from 0.7 ±0.4 to 0.08 ±0.03 GPa upon reducing the alkyl chain length of the ligands coating the Co nanoparticles from C18 （oleic acid） to C12 （lauric acid）. The hierarchical mechanical behavior is rationalized using a dimensional model of the stress-strain relationship in supracrystals.

关键词： supracrystal crystallinity anisotropy orientational alignment mechanical properties

Characteristics of InSAR Coseismic Deformation and Slip Distribution of the Akto M_S6. 7 Earthquake,Xinjiang

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维普期刊数据库

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Earthquake Research in China 2019年第3期33卷 503-513页

作者： QIU Jiangtao ZHAO Qiang LIN Peng The Second Monitoring and Application Center CEA

The Akto MS6. 7 earthquake occurred near the western end of the Muji fault basin in the top of the Pamir syntaxis. The main shock of this earthquake is complicated and the focal mechanism solutions based on the seismic wave inversions are different. Based on the Sentinel-1 SAR data,the coseismal deformation field of the earthquake is obtained by In SAR technique. Based on the elastic half-space dislocation model,the geometrical parameters and the slip distribution model are determined by nonlinear and linear inversion algorithms. The results show that the distributed slip model can well explain the coseismic deformation field. The earthquake includes at least two rupture events,which are located at 7 km(74. 11°E,39. 25°N)and 33 km(74. 49°E,39. 16°N)east from the epicenter according to the CENC. The deformation field caused by the earthquake shows a symmetry distribution,with the maximum LOS deformation of 20 cm. The main seismic slip is concentrated in the 0-20 km depth,and the maximum slip is 0. 84 m. The seismic fault is the Muji fault,and this earthquake indicates that the northeastward push of the Indian plate is enhanced.

关键词： The Akto earthquake InSAR Coseismic slip distribution Muji fault Focal mechanism

Current Vertical Motion Analysis of Northwestern Margin of Ordos Based on Precise Leveling

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Earthquake Research in China 2018年第1期32卷 113-118页

作者： Guo Baozhen Ta La Zhou Haitao Su Guangli The First Monitoring and Application Center CEA

Ordos block was squeezed by the Qinghai-Tibetan block and North China block,and the tectonic activity was intense. In the periphery of Ordos block,there was a series of folds zones and compressed faults with complicate structures. This paper used three-phase data of 1980,1990 and 2014 to calculate vertical velocity of Northwestern margin of Ordos and the analytical results indicated that(1) the Hetao basin between the rise of Yinshan fault block and Ordos fault block showed relatively subsidence,in which Linhe basin was the most evident and the subsidence rate was about 2-4 mm/a. The subsidence rate of Jartai-Yinchuan rift zone on the western margin of Ordos block was about 2 mm/a;(2) the whole testing zone exhibited the evident inherited movement characterized by mountain rise and basin subsidence;(3) the two leveling section through the northern margin fault and Dengkou-Benjing fault showed that the difference between vertical velocities on two sides of the fault was less than 0. 5 mm/a.

关键词： Precise leveling Ordos Fault Vertical velocity

Fluctuation in Ommastrephe bartrami yield in the North Pacific

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Chinese Journal of Oceanology and Limnology 2008年第4期26卷 353-356页

作者：郑蕊陈戈 Second Monitoring and Application Center CEA Ocean Remote Sensing Institute Ocean Universiiy of China

The fluctuation in Ommastrephe bartrami yield from 1995 to 2001 in the North Pacific was shown obvious, on which this study was conducted using data of sea surface temperature （SST）, chlorophyll-a （chl-α） and statistical production. The study shows that, cool water and low food abundance caused by abnormal Kuroshio resulted in the reduction in abundance of O. bartrami, which was worsened by excessive catch and the unawareness to local fishery resources protection.

关键词： Ommastrephe bartrami SST chlorophyll-a North Pacific Ocean RS yield fluctuation

Research on Locating the Source of Abnormal Disturbances in the Border Region of Shaanxi and Gansu

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Earthquake Research in China 2015年第2期29卷 258-264页

作者： Zhang Xi Wang Qingliang Jia Peng The Second Monitoring and Application Center cea

Abnormal disturbances, s uch as sharp pulses, w ere observed by vertical pendulum tiltmeters in Wudu, Hanzhong and Ningshaan seismic stations on August 6, *** to the time and spatial location of the anomalies,we build a"source precursor"propagator to calculate possible focal region by aid of quasi-Newton least squares and grid search methods. The calculated focal region is located at the aftershock area of the Wenchuan earthquake on the northern section of Longmenshan fault zone,which may be related to the 54km-away M S5. 0 Pingwu-Beichuan earthquake,with starting time of about thirty three hours before the earthquake.

关键词： Wenchuan aftershock Sharp pulse disturbance Source precursor signal

Study on Postseismic Impact of Wenchuan Earthquake on the Sichuan-Yunnan Region Based on Three-Dimensional Viscoelastic Finite Element Method

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Earthquake Research in China 2019年第4期33卷 632-647页

作者： JIANG Fengyun ZHU Liangyu LI Yujiang The Second Monitoring and Application Center CEAXi'an 710054China The Institute of Crustal Dynamics CEABeijing 100085China

Based on the lateral segmentation and vertical stratification characteristics of the crustal medium in Sichuan-Yunnan region,and the asymmetry of the static dislocations on the coseismic fault plane of the Wenchuan M_S8.0 earthquake,we built a three-dimensional viscoelastic finite element model of the crust in the Sichuan-Yunnan *** postseismic impact of the Wenchuan M_S8.0 earthquake on the Sichuan-Yunnan region was *** results show that:①The far-field horizontal deformation caused by the viscoelastic relaxation of the medium in the 10 years after the earthquake is about 0-20 mm within the Sichuan-Yunnan diamond-shaped block,which has a greater influence on north side and smaller on south side.②In the 10 years after the earthquake,the far-field vertical deformation caused by the viscoelastic relaxation effect of the medium is small,and it shows an increase of about 0-4 mm in most areas of the Sichuan-Yunnan diamond-shaped block.③The Xianshuihe fault and the eastern segment of the East Kunlun fault,which are close to the seismogenic fault,show a high gradient on deformation fields after the earthquake.④In order to compare with the strong earthquake activity in the SichuanYunnan region after the Wenchuan earthquake,the horizontal stress state and the Coulomb failure stress change of the active block boundary are also *** the spatial distribution of the coseismic and postseismic displacement field,the fault activity characteristics reflected by the stress state and the stress loading of the fault layer reflected by the Coulomb failure stress change,there is a certain correlation with the spatial distribution of strong earthquake activity in this region.

关键词： Wenchuan M_S8.0 earthquake Finite element Viscoelastic relaxation Sichuan-Yunnan region

Progress of the satellite laser ranging system TROS1000

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Geodesy and Geodynamics 2015年第1期6卷 67-72页

作者： Guo Tangyong Wang Peiyuan Li Xin Zhu Wei Zou Tong Li Shipeng Luo Qingshan Key Laboratory of Earthquake Geodesy Institute of Seismology CEA Wuhan Base of Institute of Crustal Dynamics CEA Space Research Institute Austrian Academy of Sciences

The mobile satellite laser ranging system TROS1000, successfully developed in 2010, achieves a high repetition rate and enables daytime laser ranging. Its measurement range has reached up to 36000 km with an accuracy as precise as 1 cm. Using recent observations in Wuhan, Jiufeng, Xianning, and Rongcheng, Shandong, we introduce the progress made using this mobile observation system.

关键词： Satellite laser ranging k Hz ranging Mobile SLR Event timer Crustal deformation Observation technology Beidou second-generation

Control of light emission of quantum emitters coupled to silicon nanoantenna using cylindrical vector beams

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Light(Science & Applications) 2023年第10期12卷 2248-2255页

作者： Martin Montagnac Yoann Brûlé Aurélien Cuche Jean-Marie Poumirol Sébastien J.Weber Jonas Müller Guilhem Larrieu Vincent Larrey Franck Fournel Olivier Boisron Bruno Masenelli Gérard Colas des Francs Gonzague Agez Vincent Paillard CEMES-CNRS Universitéde ToulouseToulouseFrance ICB Universitéde BourgogneCNRSDijonFrance LAAS-CNRS Universitéde ToulouseToulouseFrance cea-leti UniversitéGrenoble-AlpesGrenobleFrance Universitéde Lyon UniversitéLyon 1CNRS UMR 5510ILMVilleurbanneFrance Universitéde Lyon INSA LyonCNRSEcole Centrale de LyonUniversitéLyon 1CPEUMR 5270INLVilleurbanneFrance Bruno Masenelli

Light emission of europium(Eu^(3+))ions placed in the vicinity of optically resonant nanoantennas is usually controlled by tailoring the local density of photon states(LDOS).We show that the polarization and shape of the excitation beam can also be used to manipulate light emission,as azimuthally or radially polarized cylindrical vector beam offers to spatially shape the electric and magnetic fields,in addition to the effect of silicon nanorings(Si-NRs)used as *** photoluminescence(PL)mappings of the Eu^(3+)transitions and the Si phonon mappings are strongly dependent of both the excitation beam and the Si-NR *** experimental results of Raman scattering and photoluminescence are confirmed by numerical simulations of the near-field intensity in the Si nanoantenna and in the Eu^(3+)-doped film,*** branching ratios obtained from the experimental PL maps also reveal a redistribution of the electric and magnetic emission *** results show that it could be possible to spatially control both electric and magnetic dipolar emission of Eu^(3+)ions by switching the laser beam polarization,hence the near field at the excitation wavelength,and the electric and magnetic LDOS at the emission *** paves the way for optimized geometries taking advantage of both excitation and emission processes.

关键词： excitation cylindrical spatially